Clang: Enable stack traces

Change-Id: Ia7b8b7aa598f74e2c80e27f328ac5ddb410c043e
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/tools/clangbackend/clangbackendmain.cpp

@@ -54,6 +54,7 @@ int main(int argc, char *argv[])
     ClangBackEnd::Messages::registerMessages();
 
     clang_toggleCrashRecovery(true);
+    clang_enableStackTraces();
 
     ClangBackEnd::ClangIpcServer clangIpcServer;
     ClangBackEnd::ConnectionServer connectionServer(application.arguments()[1]);